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 A220581 Equals one maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..1 3Xn array 1

%I #4 Dec 16 2012 12:12:11

%S 1,32,91,1441,8334,64497,436288,3036588,21023792,146254012,1011489196,

%T 7016643627,48603225482,336693889957,2332461879768,16156948253940,

%U 111913294295697,775187951935208,5369332881497134,37190288381188178

%N Equals one maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..1 3Xn array

%C Row 3 of A220579

%H R. H. Hardin, <a href="/A220581/b220581.txt">Table of n, a(n) for n = 1..27</a>

%e Some solutions for n=3

%e ..0..0..1....1..1..1....0..0..1....1..0..0....0..1..1....1..0..0....0..0..0

%e ..1..0..1....1..0..0....1..0..1....0..1..0....1..1..0....0..0..1....0..0..1

%e ..1..0..0....0..0..1....1..0..1....0..0..0....0..1..1....1..0..1....1..1..0

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 16 2012

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